CVE-2026-93538 Missing authorization in Rancher
Attackers can spoof cluster labels during registration to access other tenants' GitRepo and Bundle configurations in SUSE Rancher Fleet.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-93538?
CVE-2026-93538 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster. This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.
Which versions are affected by CVE-2026-93538?
It affects 1 product.
Products include Suse Rancher Fleet.
How do I fix CVE-2026-93538?
No fix has been published for CVE-2026-93538 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-93538 being exploited?
There is no known exploitation of CVE-2026-93538 in the wild and no public exploit code.
Other vulnerabilities in SUSE Rancher
- CVE-2026-44935 Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer
- CVE-2026-41050 Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering
- CVE-2026-88808 Privilege escalation in Rancher
- CVE-2026-44938 Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent
- CVE-2026-44937 SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components
Sources
Also known as GHSA-h9p5-fp5h-qpqr.